AI Article Synopsis
- - The study investigates how salinity affects nitrogen (N) removal in coastal marshes, particularly in Shihwa marsh, Korea, using sediments from different sub-marshes and a closed incubation system with added nitrogen.
- - Results indicated that sediments with higher salinity had slower nitrogen transformation rates, such as mineralization and denitrification, and that denitrification is primarily influenced by organic carbon levels rather than salinity.
- - The findings suggest that denitrification is the main process for nitrogen loss in this marsh, estimating its nitrogen removal capacity at about 337 kg N per day, highlighting the relationship between salinity and organic carbon in nitrogen removal efficiency.
Article Abstract
Constructed coastal marsh regulates land-born nitrogen (N) loadings through salinity-dependent microbial N transformation processes. A hypothesis that salinity predominantly controls N removal in marsh was tested through incubation in a closed system with added-NH using sediments collected from five sub-marshes in Shihwa marsh, Korea. Time-course patterns of concentrations and N-atom% of soil-N pools were analyzed. Sediments having higher salinity and lower soil organic-C and acid-extractable organic-N exhibited slower rates of N mineralization and immobilization, nitrification, and denitrification. Rates of denitrification were not predicted well by sediment salinity but by its organic-C, indicating heterotrophic denitrification. Denitrification dominated N-loss from this marsh, and nitrogen removal capacity of this marsh was estimated at 337 kg N day (9.9% of the daily N-loadings) considering the current rooting depth of common reeds (1.0 m). We showed that sediment N removal decreases with increasing salinity and can increase with increasing organic-C for heterotrophic denitrification.
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| http://dx.doi.org/10.1016/j.marpolbul.2018.02.037 | DOI Listing |
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